Monoglycol ester of salicylic acid.



g 3 tion of the disalicylic ester.

Patented July 18, 1905.

PATENT OFFICE.

FRITZ HOFMANN, OF ELBERFELD,

BRIKEN OF ELBERFELD 00., OF NEWV YORK.

ASSIGNOR TO FARBENFAQ N. Y., A CORPORATION OF GERMANY,

NEW YORK,

MONOGLYCOL ESTER OF SALICYLIC ACID.

SPECIFICATION forming part of Letter Application filed November To all whom it 1nd, concern:

Be it known that I, FRITZ I-IOFMANN, doctor of philosophy, chemist, residing at Elberfeld, Germany, (assignor to the FARBENFABRIKEN on ELBERFELD COMPANY,

invented a new and useful Improvement in w Monoglycol Ester of Salicylic Acid; and I hereby declare the following to beaclear and exact description of my invention.

My invention relates to the preparation of a new pharmaceutical product, which is chemieally the ester of ethylene glycol, 021 14 (OHb, and salicylic acid, the monoglycol ester of salicylic acid of the formula OH (JuHi GO.O.CH2.CH2.OH

and which according to my researches pos- 2 sesses valuable therapeutic properties, being a good remedy against rheumatism, about three to ten grams being employed for one external application.

The process for producing my new com- 5 pound consists in treating ethylene glycol and salicylic acid with strong acids in the manner suitable for the method of esterification. It is preferable to employ a surplus of ethylene glycol in order to avoid the forma- In carrying out my process practicallyI can proceed as follows, the parts being by Weight:

A mixture of one thousand parts of salicylic acid, two thousand parts of ethylene glycol,

and seventy-five parts of sulfuric acid (60 Baum) is heated on the water-bath for about from twenty-four to thirty-six hours. After cooling the reaction mass is mixed with nine of New York) have s Patent No. 794,982, dated July 18, 1905.

3,1904:- Serial No. 231,268.

thousand parts of water and is then shaken with ether after the addition of such a quantity of a sodium-carbonate solution that the The ethereal solution, which contains the new ester, is then separated from the water and dried over anhydrous sulfate of sodium, the ether is driven Off, and the residue is distilled in cacao. The new compound thus obtained passes over at 173 centrigrade under about fifteen millimeters pressure. It is a limpid odorless oil which refracts light strongly. Its alcoholic solution is colored violet by ferric chlorid. It is split up into salicylic acid and ethylene glycol when reacted upon by caustic alkalies.

Having now described my invention and in what manner the same is to be performed, what I claim as new, and desire to secure by Letters Patent, is

The herein-described new monoglycol ester of salicylic acid having the above-given form- FRITZ HOFMANN.

Witnesses:

O'r'ro KONIG, I'IINR. ATLEFELDER.

mixture is alkaline after being well shakenf ula and being a limpid odorless oil boiling at 

